Not all motionlaws have a SegmentRange.
These parameters 'clip', or 'remove', the start or end of the mathematicalfunction that defines the motionlaw.
Start and End Segment Ranges 
Segment Ranges  only with, but not all, Traditional MotionLaws. The parameters are:


The Segment Range values are limited to: 0 ≤ Start Range < End Range ≤ 1 Notes:


The images shows the acceleration graph of a Modified Sinusoid motionlaw.
The SegmentWidth does not change. 

Example 2
A 'StartRange' of 0.2 removes the first 20% of the ModifiedSinusoid segment. The SegmentWidth does not change. 

Example 3
An 'EndRange' of 0.8 removes the last 20% of the ModifiedSinusoid segment. The SegmentWidth does not change. 

see also: Segment Editor: SegmentWidth, Segment Editor: Parameters 
Symmetrical Motions The crossover [acceleration becomes deceleration, or viceversa] is at the midpoint of the SegmentWidth. Asymmetrical Motions The crossover is not at the midpoint of the Segment Width. When to use Asymmetrical Motions Often, you want a machine tool to accelerate quickly from a dwell until it reaches a peak velocity sooner than the 0.5 point, followed by deceleration that takes longer and more gradually than the standard deceleration. Or viceversa. 

You can model an asymmetrical motion with two segments that have the same motion law  for example a Modified Sinusoid.
Orange Line graph : Symmetrical ModSine MotionLaw : λ = 0.5 This motionlaw is usually specified with one standard ModSine segment Here, we have specified it with two ModSine segments. Segment 1 Machine angle: 0  180º [ 0  0.5 of total duration] Displacement : 0  50 units Segment Ranges = 0 and 0.5. Segment 2 Machine angle: 180  360º [ 0.5  1.0 of total duration] Displacement : 50 100 units Segment Ranges = 0.5 and 1.
Black Line graph : Asymmetrical ModSine MotionLaw : λ = 0.25 Crossover @ 0.25 = 90º machine angle. This can be modelled with two ModSine motions: Segment 1: Machine angle: 0  90º [0  0.25 of total duration] Displacement : 0  25 units Segment Ranges : 0 and 0.5. Segment 2: Machine angle: 90  360º [0.75  1.0 of total duration] Displacement : 75  100 units Segment Ranges = 0.5 and 1. Characteristics Values of Asymmetrical MotionLaw. Velocity : No Change to Symmetrical MotionLaw. Acceleration: Segment 1 : Cas = Ca / 2λ ; Acceleration: Segment 2 : Cas = Ca / 2(1λ) 